Question

Which property of an electromagnetic wave, depends on the medium in which it is travelling?

• A. None of the above
• B. Time period
• C. Frequency
• D. Velocity

Answer 1

The correct option is D Velocity

The frequency and time period can vary according to the wave producing source. But, the velocity of an electromagnetic wave depends upon the medium through which it is travelling. The velocity of wave in a vacuum is termed as speed of light, which is assumed to be $3\times {10}^8\text{m/s}$.